go to isky s web site and find out the spring specs they recomend,might have to upgrade the whole valve train lifters rockers push tubes springs then hope its not too big of lift. usually race cams have a big lift if its too big you may have to have the valves angle cut , for piston to valve clearance, or find a good machine shop and talk to someone who really knows and could lead you in the right direction,it could get costly but its better to do it once and do it right than have to redo it and cost more money